Bob's lawn -mowing service is a profit-maximizing, competitive firm. Bob mows lawns for $27 each. His total co?

Bob's lawn -mowing service is a profit-maximizing, competitive firm. Bob mows lawns for $27 each. His total cost each day is $280, of which $30 is fixed cost. He mows 10 lawns a day. What can you say about Bob's short-run decision regarding shutdown and his long-run decision regarding exit?